mcgregor



(No medial.

w. F. MoGREGOR. RATCHET MONKEY WRENGH.

No. 256,351. Patented Apr. 1-1,1 882.-

N, PETERS. Pl'\oirbl-Itlwgnuhzrv Waihinglon. D.C.

WlLLIAM r. McGREGOR, OFOHIGAGO, ILLINQIS, Assreuoa o JOHN o,

' NITED' STATES MAGGREGOR, or SAME rn on.

VRATCHEIT MONKEY-WRENCH.

SPECIFICATION forming part of Letters i=a.t nt No. 256,351, dated Apri1 11 ,"1e '2. Application filed August 10, 1881. No model.) i I i v To all whom at may concern Be itknown that I, WILLIAM RMcGREGoR, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Ratchet Monkey-Wrenches, which are fully described in the following specification, reference being had to the accompanying drawings, in which Figure 1 represents a plan view of my improved monkey-wrench with the jaws wide open; Fig. 2, a similar view, showing the rear of the disks, and broken so as to show the right and left hand threaded screw which operates the jaws; Fig. 3, a section taken on the line .70 m, Fig. 1, showing the ratchet or locking device; Fig. 4, a transverse sectional view taken on the line 3 3 Fig. 1; Fig. 5, a detached detail view of one of the disks; Fig. 6, a detached detail view of one of thejaws, and Fig.7 adetail view of the ratchet or locking device.

The object of my invention is to construct a ratchet monkey-wrench with adjustable jaws and a locking device to hold the jaws in any desired position, and to so construct thelocking device that the motion of the wrench may be easily and readily reversed without removing it from its position. 1

My invention consists in the peculiarshape of the jaws and of the disks, into which the jaws are fitted to move in opposite directions at the same time by means of a screw with right and left hand threads at either end thereof.

It also consists in special devices and combinations of devices, all of which will be hereinafter more fully described, and definitely pointed outin the claims.

Similar letters of reference referto similar parts in the drawings.

A A are thejaws,through the lugs of which the screw a passes,the latter havingright and left threads thereon at either end, and which is made to adjust the jaws whenever desired byturningwith the thumbor'finger thethumbwheel a. This double-threaded screw and the thumb-wheel are made preferably of one piece of metal, but may be made of two pieces.

B B are the ratchet-disks, each beingnotched orrecessed at regular intervals to permit-the pawl-D to enter' and i hold them; in position when thewrench is in use, asshown 'in'Fig. 5 of'the drawings.

0 is the' frame or holder, which is made to surround the disks, and thus serve also as a guide to keep them in place when the wrench is in use.

On the outer surface of the disk B, of even thickness with the exposed portion of thejaws A A, is a plate or guide, A, fastened to the disk by means of screws or suitable rivets, b ,as shown in plan view, Fig. 1, and in section, Fig. 4., for the purpose of guiding thejaws and giving more strength to them when the wrench is in use. The jaws A A are each castin one piece of metal with lugs a through which threaded holes are cut for the screw ato enter, which latter operates to move the jaws in the desired direction by turning the thumb-wheel a, as seen at Fig. 2. The ratchet-disks B B are also each cast in one piece of metal, with projections or rims on their outer surfaces to fit against the encircling part of the frame 0, and with depressionsin theirinner edges,into which the pawl or locking deviceD is sprung to hold them in place when a belt or nutis beingturned, as shown in Fig. 5. These disks B B are fastened together with screws or in any suitable manner, and'are made with holes 1) near the center of their circumferences, through which topass a bolt or rod. I

On the inner face of the disk B a groove or seat is cut or east to receive the lugs a of the jaws A andthe double-threaded screw 0., with its thumb-wheel a; and longitudinally across theouter face of the diskB is a ridge, B which latter is to permit a deeper groove or seat to receive the lugs of the jaws, all of which is shown in Fig. 2.

Across the face, and extending nearly to the depressions in the disk B, is cutor cast a slot, E, for the lugs of thejaws to slide in, as shown in Fig. 5.

The frame or handle (3 is of metal, cast in one piece, and is hollow at its center to admit the pawl or locking device I), and around the rear end of this ratchet is fitted a spiral spring, d,

to force itinto the depressions in the disks, and thus firmly hold the jaws in position when the wrench is in use. The pawlD is made square atit-scentertofitinto the thumb-wheel D,which latter has a square hole in the center of its circumference, and servesto turn the pawl D when it isdesired to reversethe motion of thcwreneh, all of which is plainly shown in Fig. 3.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a ratchet monkey-wrench, the combination of thejaws A, thedouhle-thrcaded screw (1 with the thumb-wheel a, the disks B B, and the plate or guide A, constructed and arranged as herein described and shown.

2. The disks B B, with notchesin their outer circumferences, (thedisk B having ridge 13 the disk B having slot E,) the screw a a, thejaws A, and the guide A, as described and shown, in combination with the frame 0 and pawl D, substantially as and for the purpose specified.

3. The frame O,hollow at its center, pawl D, thumb-wheel D, and spiral spring, d,in combination with the disks B B, provided with notches, jaws A, with double-threaded screw a, and guide A,substantially as and for thepnrpose specified.

4. A ratchet monkey-wrenchhavingjaws A,

a plate or guide, A, disks B B, frame 0, pawl D, with thumb-wheel D and spiral spring d, double-threaded screw 11 with thumb-wheel a, all arranged and operating substantially as herein shown and described.

WILLIAM F. MGGREGOR. Witnesses:

ALIoE HOLLISTER, W. O. OonLTEs. 

